Schedule II - Condensed Financial Information of Parent - Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Net investment income									$ 2,792.0	$ 2,669.0	$ 2,641.0
Net realized capital gains (losses)									(166.0)	(355.0)	(209.0)
Other revenue									465.0	443.0	379.0
Total revenues	$ 1,810.0	$ 1,875.0	$ 1,969.0	$ 1,822.0	$ 1,851.0	$ 1,890.0	$ 1,761.0	$ 1,661.0	7,476.0	7,163.0	7,229.0
Expenses:
Interest expense									176.0	221.0	184.0
Operating expenses									2,746.0	2,606.0	2,562.0
Total benefits and expenses	1,744.0	1,726.0	1,726.0	1,720.0	1,725.0	1,661.0	1,596.0	1,653.0	6,916.0	6,635.0	6,844.0
Income (loss) from continuing operations before income taxes	66.0	149.0	243.0	102.0	126.0	229.0	165.0	8.0	560.0	528.0	385.0
Income tax expense (benefit)									(205.0)	37.0	687.0
Net income (loss) before equity in earnings (losses) of subsidiaries									(301.0)	1,020.0	(2,775.0)
Equity in earnings (losses) of subsidiaries, net of tax									0.0	0.0	0.0
Net income (loss)	(766.0)	140.0	252.0	73.0	177.0	168.0	229.0	446.0	(301.0)	1,020.0	(2,775.0)
Less: Preferred stock dividends	4.0	14.0	0.0	10.0	0.0	0.0	0.0	0.0	28.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders	$ (776.0)	$ 107.0	$ 226.0	$ 64.0	$ 120.0	$ 142.0	$ 167.0	$ 446.0	(379.0)	875.0	(2,992.0)
Parent Issuer
Revenues:
Net investment income									39.0	1.0	33.0
Net realized capital gains (losses)									(1.0)	0.0	0.0
Other revenue									0.0	(5.0)	8.0
Total revenues									38.0	(4.0)	41.0
Expenses:
Interest expense									151.0	175.0	155.0
Operating expenses									12.0	11.0	9.0
Total benefits and expenses									163.0	186.0	164.0
Income (loss) from continuing operations before income taxes									(125.0)	(190.0)	(123.0)
Income tax expense (benefit)									(277.0)	0.0	113.0
Net income (loss) before equity in earnings (losses) of subsidiaries									152.0	(190.0)	(236.0)
Equity in earnings (losses) of subsidiaries, net of tax									(503.0)	1,065.0	(2,756.0)
Net income (loss)									(351.0)	875.0	(2,992.0)
Less: Preferred stock dividends									28.0	0.0	0.0
Net income (loss) available to Voya Financial, Inc.'s common shareholders									$ (379.0)	$ 875.0	$ (2,992.0)